Let’s write it down.

To be honest, I don’t remember when I actually started thinking about writing down most of the solutions I found on the internet or implemented myself. I realized that from time to time I go back to solutions, code snippets or config files I created or modified to fulfill some specific requirements. It’s good if I wrote it down somewhere, put it on Gist or Pastebin, but what if I did not? Let’s say I just configured Nginx as a load balancer and, for example, after a year or so I need to make something exactly the same or at least similar. What then? I need to go through the Nginx documentation again or start searching on Google. Sure, in some cases I remember exactly how I solved a specific problem, but when it was some time ago then… This is the reason why I decided to create this simple blog. I hope it won’t evolve in any unpredictable way. You can think about this blog as my notebook. If somebody else finds my notes useful/helpful - even better. Let’s make this World better.

Have a great day.

P.S. As you probably noticed, I’m not a native speaker, so in case you find some mistakes in my posts (probably more than one), please let me know ASAP.

RAM vCPU Price (€)
1G 1 5
2G 2 10
4G 4 30
8G 6 60
12G 8 120
16G 10 160
24G 12 240
32G 16 320

Our universe (in SI units):

\[\begin{align*} \frac{\partial\mathcal{D}}{\partial t} \quad & = \quad \nabla\times\mathcal{H}, & \quad \text{(Faraday's law)} \\[5pt] \frac{\partial\mathcal{B}}{\partial t} \quad & = \quad -\nabla\times\mathcal{E}, & \quad \text{(Ampère's circuital law)} \\[5pt] \nabla\cdot\mathcal{B} \quad & = \quad 0, & \quad \text{(Gauss's law for magnetism)} \\[5pt] \nabla\cdot\mathcal{D} \quad & = \quad 0. & \quad \text{(Coulomb's Law)} \end{align*}\]

\(\begin{align*} & \phi(x,y) = \phi \left(\sum_{i=1}^n x_ie_i, \sum_{j=1}^n y_je_j \right) = \sum_{i=1}^n \sum_{j=1}^n x_i y_j \phi(e_i, e_j) = \\ & (x_1, \ldots, x_n) \left( \begin{array}{ccc} \phi(e_1, e_1) & \cdots & \phi(e_1, e_n) \\ \vdots & \ddots & \vdots \\ \phi(e_n, e_1) & \cdots & \phi(e_n, e_n) \end{array} \right) \left( \begin{array}{c} y_1 \\ \vdots \\ y_n \end{array} \right) \end{align*}\)

\[\begin{array}{c|lcr} n & \text{Left} & \text{Center} & \text{Right} \\ \hline 1 & 0.24 & 1 & 125 \\ 2 & -1 & 189 & -8 \\ 3 & -20 & 2000 & 1+10i \end{array}\] 
def show
  @widget = Widget(params[:id])
  respond_to do |format|
    format.html # show.html.erb
    format.json { render json: @widget }
  end
end
package interfaces
import (
	"io"
	"os"
)

//PipeExample function
func PipeExample() error {
	r, w := io.Pipe()

	go func() {
		w.Write([]byte("test\n"))
		w.Close()
	}()

	if _, err := io.Copy(os.Stdout, r); err != nil {
		return err
	}
	return nil
}
package interfaces

import (
	"fmt"
	"io"
	"os"
)

// Copy data from std in to std out
func Copy(in io.ReadSeeker, out io.Writer) error {
	w := io.MultiWriter(out, os.Stdout)
	if _, err := io.Copy(w, in); err != nil {
		return err
	}
	in.Seek(0, 0)
	buf := make([]byte, 64)
	if _, err := io.CopyBuffer(w, in, buf); err != nil {
		return err
	}

	fmt.Println()
	return nil
}

–robert